Navy Secretary Ray Mabus on Tuesday ordered broad security reviews for all Navy and Marine Corps bases and installations in the United States, one day after a contract worker — who had obtained a security clearance despite a history of violent behavior — killed 12 people in a shooting rampage at the Washington Navy Yard.

Navy veteran Aaron Alexis, 34, was killed by police bullets on Monday morning, ending the deadliest day in the Washington region since the terrorist attacks of 2001. Several other people were wounded in the shootings, including a veteran D.C. police officer shot in both legs.

But, time after time, Alexis seemed to escape the worst potential consequences of his alleged actions. Charges were dropped. The Navy allowed him to leave with an “honorable” discharge, even after a history of misconduct.